I think the tendency of "knockout" perps is to pick easy victims. Orthodox Jews are not generally seen as being Kung-fu masters (or even adept at Krav maga). Perhaps that should change. I would think that NYC Orthodox Jews would benefit from going to Israel and spending a couple of years in the Israeli Army when they turn 18. Maybe ask some Israeli commandos to come over and conduct martial arts and weapons training classes for some young Orthodox boys and girls.
Having a TV segment on that would do more to reduce "knock out" attacks than any number of "interfaith" events.
I took the Russian defense called Sambo (not the cartoon). That was really neat. Maybe Krav Maga is even better. You know that Jennifer Lopez used krav maga in her politicaly correct, whit man bashing film, "Enough," don't you?